Manhole-form



F. L. YOUNG.

MANHOLE FORM.

APPLICATION FILED NOV. 6, 1920.

1,400,927., r Patented Dec. 20, 1921..

3 SHEETS-SHEET I.

WITNESSES A TTOR/I/EYS F. L. YOUNG.

MANHOLE FORM.

APPLICATION FILED NOV. 6, 1920.

Patented 1060.20, 1921.

3 ISHEET$-SHEET 2.

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A TTOR/VEYS L nixs mm F. L. YOUNG.

MANHOLE FORM.

APPLlCATl ON FILED NOV. 6,1920.

1 ,400,927 Patented Dec. 20, 1921.

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Application filed November 6, 1920. Serial No. 422,214.

other tubular bodies having restricted outlets, but also adapted for tubular bodies of any character, wherein the improved form 1s composed. of. a series of sections so connected that they may be detached from each other to permit their removal through a restricted oaening, and having means for expanding said sections to the desired diameteryand capable of being removed through the restricted openin In the drawings Figure l is a ver ical section of a man hole with the form in place,

Fig. 2 is a horizontal section through the form,

Fig. 3 is a perspective view of a unit of the upper reducing section,

Fig. i is a similar view of a unit of one ot the lower or body sections,

Fig. 5 is a vertical section through aunit of the upper or reducing section,

Fig. 6 is a partial perspective view of one or the lower sections,

Fig. 7 is plan view of another embodiment of the invention, 7

Fig. 8 is a. vertical section of the same,

Fig. 9 is a horizontal section.

Fig. 10 is a sectional detail showing another method of forming the grooves.

In the embodiment of the invention shown in Figs. 1 to 5, the form is composed of an upper section and one or more lower sections. The lower sections are composed of units of the character shown in Fig. 4-. Each of these units is a plate or sheet 1 of sheet metal, of suitable gage, and at one side edge each unit is provided with a groove which is adapted to receive the other edge of the succeeding unit.

This groove may be formed in any desired manner. As for instance, in Fig. e, the side edge of the plate 1 is ofi'set outwardly as indicated at 2, and a strip 8' 01" metal is secured to the body of the plate 1, extending beyond the body of the plate, but

not beyond the trceedge of the outwardly oil'sct portion 2. Thus there 1s provided a space between the st ip 3 and the outwardly oil set portion 2 of awidth to receive the side edge of the succeeding unit. Thus the units of a section may be connected together, there being provided registering openings, if desired, for receiving pins or the like to connect the units.

Each of the units with one exception, is provided with the groove t before mentioned, the said other unit having the outwardly offset portion 2, but not being provided with the strip 3, as clearly shown in 2. This unit 1 has an outwardly offset portion 2, and this laps over the side edge of the succeeding unit.

Thus each oi"? the lower sections is built up from a series of similar units, and the units or each series are of the same length, as may be of any convenient width. it being understood that the width does not exceed the diameter oi the restricted opening through which the units must be removed from the completed manhole.

Referring to Fig. l, it will be seen that the free edge of the strip 3 does not extend as far as the free edge of the ofiset portion 2, and the extensfuonor the otliset portion 2 provides a guide for the entering into the groove t of the edgeyoi' the succeeding section. is many units may be provided in a course or section as may be desired, it being understood "that the units are curved slightly transversely on an arc whose center is the center of theman hole, and each section of unitsiorms a cylindrical body.

The lowermost section diiiers slightly from the intermediate sections, in that certain of the units are notched as indicated at 5 to receive the conduit pipe 6, said notches being or" depth corresponding to approximately half the diameter of the pipe. Preferably four units of this series are provided with notches, the units being arranged so that the pipes may extend at right'angles with respect to each other.

The uppermost section differs from the other sections, in thatit is a reducing section. As shown in Fig. 3, each of the units 7 is of greatest width at its bottom and tapers to ward its top, and the ends of the unit are bent to lie at an obtuse angle with respectto the body, andto extend approximatelyparallel as clearly shown at 8 and 9 inFig. 3.

One side edge of each unit is offset out wardly as indicated at 10, and all of the units but one have secured to the edge thereof at the said outwardly offset portion a strip'11, corresponding to the stri 3 ofFig. 4, and similarly arranged. This strip and the outwardly ofliset portion provide a groove .12 similar to'thegroove tfor receiving the side ed e of the succeeding unit.

ane of the units has no strip 11,but does have the outwardly offset. portion for lapping on the adjacent unit. The units are held in expanded condition by means of the expanding rings shown in Figs. 1 and 2. Each of these rings consists of two similar sections 13, and'the sections have at their ends inwardly extendinglugs l4.

These lugs have registering openings, and bolts 15 are passed through the openings. T he bolts are threaded at each end, and each bolt is engaged by nuts 16 on 'each side of each lug 1 By means of the nuts'16, the lugs may be forced away from each other'to expand the rings 13 to hold the sections properly expanded. i

In setting up the improved form," each series of units isfarranged with its lower end within the upper end of the preceding series, and an expansion ring is placed at each joint, inside the form. In order to prevent'spreading of the units of aseries, each series is encircled by a series of flexible members 17 of ring formation, "the said members being wires, ropes or the like, and formed from pieces having their ends connected.

As shown in Fig. 1, a flexible memberl? is arranged about the lowermost series atthe bottom of the form. Another is arranged at a point between the. lower and the intermediate series, and' other members are arranged about the intermediate series, one near the top and one intermediate the ends. An expansion ring is placed at each joint, and a smaller ring is placed at the top of the uppermost section, thatis, at the point where the portions 8 of the units join.

The uppermost reducing section is also held bv encircling flexible members. These flexible members may be left in the hole after the concrete has been poured if desired, or they may be removed it thought best. In practice, the hole for the man hole is dug. The form is then set up, and the concrete is poured. After the concrete has set. the units are removed, the sectional rings being rst released. It will be obvious that when the ring at the top and that at the bottom of the upper series of sections is removed, that unit whose edge is not received in a groovemav be moved inwardly and disengaged from the preceding unit. Thus the units be removed. in? sequence and withdrawn through the restricted opening.

Afterward the units of the other sections are withdrawn, one at a time, until the entire form has been removed. In setting up the form, it'is advisable sometimes to have a stop on' each section for limiting the downward movement of the succeeding section.

This-stop may be in the form of a clamping "ring encircling the series, and having means for clamping the ends together, orit may be a flexible member. After the expanslon rings are once expanded,'nothing is needed to hold the sections in proper position.

In practice, eight or more units areprovided in each section. The units of the lower sectionmay, if desired, be arranged as shown in Fig. 6. In this arrangement the'units 18 have one side slit near the top and bottom as The parts are thus held from slipping with respect to each other, and are held in prop-' erly spaced relation. It will be understood that in the construction 0t Fig. 6, one section has'noton ue 19, having merely the outwardly offset portion 20 which may extend the full length of the-unit. The expansion I rings are arranged at the tongues 19.

In Figs. 7 to 9 there is shown a construc tion having diiterent cross sectional form. In this arrangement the man hole is oblong or elliptical. The units 21 are the same as those shown in Fig. 3, each having one side.

edge outwardly oii'set as shown at 22, to re ceive the adjacent edge or" the succeeding unit. The units having the strips 23 corresponding to the strips 3, the said strips 23 are riveted to the units to term between them and the outwardly oiiset portions grooves for receiving the edges of the succeeding units.

Expansion rings 24 are provided, similar to the rings 13, but so shaped that they each fit within the form, and these rings are expanded by bolts 25 and nuts 26, in the same manner as the rings 13 are expanded. The

bolts engage inwardly extending lugs 27.011

the ring sections. As shown in Fig. 8, three sections are provided, namely a lower section, an intermediate section, and an upper section, the upper section being the reducing section.

It will be obvious that as many sections may be used as may be necessary, as for in stance, one or many. The units of the lower course may be suitablynotehed to receive pipes, and-it is obvious that the units of any other course mig it have openings if desired for the same purpose. I.

In Fig. 10 there is shown a construction wherein the units 28 have strips 29 riveted to their side edges to provide grooves between the said strips. This construction is the same as that shown in Fig. 3 with the exception that there is no oil'set portion of the unit, the edge of the succeeding unit being received directly between the strips.

lit will be obvious that instead of providing the double seam at the connection of the portions 8 and 9 with the body of the units 7 such seams might be omitted. These seams are provided for strengthening. The form is composed of sections, each of which is composed of a series of units, interlocking at their side edges in such manner that they may be disassembled by moving them inward, and thus may be removed through a restricted opening, together with the expanding rings for holding them expanded.

I claim:

1. A form for hollow structures of plastic material with restricted outlets, comprising courses of units, the units of each series being so shaped that when their side edges are lapped they will conform to the cross sectional shape of the structure, and the units of one series being shaped to correspond with the cross sectional shape of the outlet, expansion rings within the units of the series for holding them from collapsing, the units of each series fitting at their lower ends within the upper ends of the units of the next lower series, and flexible bands encircling the units of the series to hold them against the rings, the units of each series having interlocking mechanism at their side edges for limiting the movement of the units on each other, said mechanism being omitted from one of the units for the purpose specified.

2. A form for hollow structures of plastic material with restricted outlets, comprising courses of units, theunits of each series being so shaped that when their side edges are lapped they will conform to the cross sectional shape of the structure, expansion rings within the units of the series for holding them from collapsing, the units of each series fitting at their lower ends within the upper ends or the units of the next lower series, and flexible bands encircling the units oi the series to hold them against the rings.

3. A form for hollow structures of plastic material, comprising tubular tiers or units, the units of each tier so shaped that when their side edges are lapped they will conform to the cross sectional shape of the structure, the units of each tier fitting at their lower ends within the upper ends of the units or the next lower tier, and expansion rings within the tiers at their ends, whereby pressure at the joint between the units of succeeding tiers holds the tiers from collapsing.

i. A form for hollow structures of plastic material with restricted outlets, comprising courses of units, the units of each series being so shaped that when their side edges are lapped they will conform to the cross sectional shape of the structure, expansion rings within the units of the series for holding them from collapsing, the units of each series fitting at their lower ends within the upper ends of the units of the next lower series, and flexible bands encircling the units of the series to hold them against the rings, the units of each series having interlocking mechanism at their side edges for limiting the movement of the units on each other, said mechanism. being omitted from one of the units, for the purpose specified.

5. A form for hollow structures or" plastic material, with restricted outlets comprising courses oi units, and expanding rings for the units about which the units are arranged, said rings having means for expanding the same to the required cross sec-- tion, and each unit having one side edge ofiset outwardly to receive the adjacent side edge of the succeeding unit, and to provide a structure between. the offset portion and the body of the unit against which the edge of the other unit may abut.

6. A form for hollow structures of plastic material with restricted outlets comprising courses of units, and expanding rings for the units about which the units are arranged, said rings having means for expanding the same to the required cross section, and means encircling the units for limiting the expanding movement thereof.

7. A form for hollow structures of plastic material with restricted outlets comprising courses of units, and expanding rings for the units about which the units are arranged,

said ringshaving means for expanding the same to the required cross section.

8. A form for hollow structures of plastic material with restricted outlets comprising courses of units, and expanding rings for the units about which the units are arranged, said rings having means for expanding the same to therequired cross section, and each unit having one side edge otiset outwardly to receive the adjacent side edge of the suc ceeding unit, and to provide a structure between the ofiset portion and the body of the unit against whichthe edge of the other unit may abut, each unit having means at the outwardly offset portion for engaging the inner face of the adjacent unit to hold it from inward movement.

9. A form for hollow structures of plastic material with restricted outlets, comprising a course of units so shaped that when their side edges are lapped they will conform to the cross sectional shape of the structure, and expansion rings within the series for holding the units in expanded condition, and

flexible members encircling the unitsto hold them against the expansion rings.

l ltANK L. YOUNG. 

